You are here

April 6, 2017 : Dr. Nicolas Grosso (CNRS, Observatoire Astronomique de Strasbourg) has requested AAVSO assistance in monitoring the young eruptive star (FUOR type) V2492 Cyg from the optical to the infrared in support of X-ray observations with XMM-Newton scheduled for 2017 April 18 UT.

To support the XMM observations, beginning now and continuing through April 30, observers are requested to obtain "simultaneous optical to infrared photometry (BVRIJHK and/or the equivalent Sloan filter) in order to monitor the behaviour of the extinction and accretion, and to compare it with the level of X-ray emission that will be observed with XMM-Newton."

Specifically, nightly snapshots in as many filters as possible are requested, with priority on BVRcIc filters, 5% photometry (transformed). It is extremely important that photometry be transformed; please make every effort to transform your data before submitting them.

Dr. Grosso notes that the source may be bright enough (J~10, H~9, and K~8 mag) for JHK/Ks photometry. Visual observations are also welcome. V2492 Cyg has a range of V magnitude 13.5 - 20. As of 2017 April 5.46178 UT (JD 2457848.96178) it was 14.192 V +/-0.024 (MGW, G. Myers, Hillsborough, CA).

In addition to the observations in support of the XMM observations, weekly multicolor snapshots from May through December 2017 are requested, since it is not known whether the maximum of the outburst has already occurred.